Motor-controlled brake.



1. S. COLDWELL.

MOTOR CONTROLLEDBHAKE.

APPLxcAnou msn man. I9. lsu.

Patented Apr. 9,1918

UMTED STATES JOHN s. coLDwELL, or MILWAUKEE, WIsconsImjAssIfGNon 1ro THE QUTLERLHMIMER t MFG, co., or Mr LwAUKEE,WIsooNsIN, AjooIiPonArIoNor wIsCoNsrN.-f

springs is inadequate for this purpose end it whichv is very'undesirable. l

uoronfcomnoniinn mien-. '.11

1,261,771. spemeguqn cameraman. t Patented-Apr. 9,1918, ppnemonmeamreiz19,1917,gserxainblismse' To all 'wkoin moy concern:

Be it known that I, JOHN S. CoLnWELoe citizen of the United Shiites, residing et 11 waukee, inthe county of Milweuleejand State of Wisconsin, have invented new :ind useful Improvements in Motor-Controlled Brakes, of which the following-is" a. lull, clear, concise, and exact description, refer ence beingjhacl to theV ooconipanyingrawing, forming a part` of this specification.

This invention relates to motor controlled to s'pradihe arn'is anl' ther eb brakes and the like and is particularly aplicable to brakes -Which are mechanical set and rnotor released. i A l Such brakes are commonly provided wlth torque motors `for releasin the seme, the resist-ance `'of thebrekey setin sgring or springs beingrelied upon to sta'. l t upon full release of the brake. In'nieny in` stances. however, it 'has beenffqunfl that the resistenceofthe broke lsettingsprmg or has `also been found 'that upon resetting of the brake, withv a; .consequent mechanical drive if the motor, Lthe inertia `ol. tlie 'Inotor armature -eousesjf variable 'braking effect .Y An 4:objeotfofj the 'pres'eilt'invention is to provide reliable and eflioienti lmit means for the motor -of suoli e brake or sim'iloi def vice, by which the arrest of fthe motormey be accurately timed and effected gradually;

Another objeots to provide limit means of the character set forth Which'will permit unrestrained initial -operation of the motor'. in both directions.

Other objetsjnnd advantages lvenlon willhereinaftereppeur.

Oneemborliment of the 11'iventi-on',` namely :icmotor controlled lirsike is illustrated 1n the ac ampanying drawing, enfl the some will now` be desoribed, 'it being understood that the same- 'is susceptible ofi-various modi;

tietions felling vrithmthe scopeof the ep-l pended claims. j 'In the `drawing Y, A Figure lis ug Sicie elevation of the broke; Fig. 2. is anenlarged sectional view teken- 4 'ulostntinlly online 2-2 of Fig. l; and,

Fig. 3 is aj sectional view talren Online Reim-'ing to Fig. i, file hier@ selecteerde illustration comprises edrum 1 to be'x'ed to the shaft to be bralred, brake shoes 2` az'xdf olf tire in# 6 end conneotedotftheir free Vejl'sljy a sprmgtenson'device 7, sei'cl tension device acting on said arrosto set tliebralieI'shoes ageinsesaicl drum.` "T hiieleesihg' ntechw n ism comprises a. lever Bfpivqdzt 9 to the erm 15, said 'lever h evingen extension 410 connected.' by a. link`12` to the. iu'm" fl., This lever axid' link ,forin a ltoggsile Whichserves 'relitse the brake' shoes,l uponv e0uiiter-fc'looliwiise` r'noveLf ment ofthelever. .`Th`lever is operlale'to sorelease the Ibrake shoes b a torque motor 1f! having on its :irmeture slneft 1 5 e pinion 16 meshing with e gear sector 17 pivotsilly connected at18 upon thejliese` and having e leyer extension' I9 connected to tfli'eilev'er Y. 'Sltlirough a link 2Q. Thelink 2Q islslotte'd et 21 to provide e'lost motion Vconneotio'n be- 4`drirex'if the n fiotoi' arr'nojture' during-brake setting"A operation 1s 'very'. desireblllA ,that 1t.v inslures against setting ofthe 'brake too shaft mdf rovideclginternelly with lspaced stopsl 2 4 an 2iirrangedn opposite'sitles of dog :26 fixed "to: the ermzt'lire4 shaft; '7 This "penne-'enen @the when" and. armature 'shaft proli'rides "for ,"lrive of i the forme'r ',by," the Y latter inV opf'o'site d ir o jini limibed-` 'rof ary play o the; latter "Lrelrtive to'jtheformei ugonmreierselsof rotation of ploy; being'. equal to the tions 'but 'subie-et to 33 having pivotal bearings thereon at f reipecrively `pioneer with extensions" 32 i all 34 and 35 respectively and being connected to said levers by sprm tension devices 36 and 37 respectively. he arrangement is suchthat spreading of the extensions biases the levers through the spring tension devices to set the brake shoes a amst the brake wheei and a' cam 38 is provi eci-to so s read said extensions. The cam which'i's of o long shape isinterposed between the eirtcnsions and rotatable mounted u on they ivot stud 18 of the 'gear sector. urther, t e cam 1s provided with a rearwardly ciitendin `lu 39 (Fig. 2) projecting between ribs 1 F an 17b provided on the geur sector, s shown in Fig. 1. Thus the camA is-rendercd dependent forrotation upon operation of the gear sectorand' it is to be understood that theribs s on the sector 'are so spaced as to provide a lost motion between said cam and said sector substantially equalrto the degree of movement of thelatter incident Vto setting and release ing the motor armature o the braking action vof shoes 27 and 28. Under such conditions the motor would be .free to drive -or -to be mechanically driven. as above described.

Then ass'uiningdrive of the-sector by the motor,- the latter' would rotate the dog 2 6 to engage, stop 24 and thereupon rotate the wheel' 23,', which under the assumed cond]- tions would be relieved of the'braking action ofshoes ,27 `and 28. .Accor-din ly the motor would o U rate without retarc ation except for the sxlieght drug of its -bralte Amechanism to drive thegear sector into its brake release limit.h Thereupon the rib '17.ofsaid gear sectorwould' engage the lug 39 on the cam' 38 and rock sai-d cam torsetthe brake shoes 27 and .28 thereby gradually stalling' the motor. The motor, however, would then be free to rotate" inn. reverse direction to a degree equal tothe play between the dog 26 and stop 25,. thereby providing for initial resetting operation of the maiubrake without restraint by the motor brake. -Moreover, the resettin 'operation would cause the gear sector to reiase the c aln 88 thereby relieving .the .motor shaft of the braking action of shoes 27 and 28 andas `shown the arrangement issuch as to etl'ect this operation dur-A een ing the rotation ofthe armature shaft to bring; the dog 26. intocngngement with stop 25. Thenv assuming continued resetting operation, thegenr. sector wouldupon running into its brake vsettin limit rock the cam- 38 in ,a inverse-direction through the Vmediumjofits.1jib17 end-thereby again set the brakeshoes 27 and 28 to gradually arV rest the motor. In this connection .it is to be noted that the lost motion'connection b'etween the lever and geur sector would per- Init e. slight over-travel of the latter after full setting' of the 4main brake and with the `arrangement shown this over-travel of theV sector is utilized for setting ,of the 'brake' shoes 27 and 28. In other words, the scttili of thefbralre shoes would bev-delayed unt:

`over-travel of the sector, thereby 'insuring full setting operation of 'the mainlbrake l prior to arrest of the motor.

' After arrest of the motor as last described, the same would be free to rotate in a .reverse direction free from restraint,I by `brake shoes 27 and 28, i. e., in brake relesing direction dog 26 and stol 24. Upon s ucl'i' rotation the motor would rive the ear sector. release brake lshoe's'27 end-281; ereby restoring the through a range equal to the play between i partsto the relation rsta'ssumed. f

What .I claim'as new and 'desire to secure byLettersjPatent is: T j

41. In combination, a braking device to be operated, a torque motor for operating the saine and braking means for said motor openable automatically upon a given operation of'said device to restrain further-operation of said motor in the saine directionwhile )ermitting Areverse operation of said motorv reejrom restraint thereby. I-n combination, a braking device biased in onedirectiomn torque motor to `o crate saiddevie in a reverse direction an 'to ,be

.driveii thereby according to its torque value d means forgradually'braking and arrestmgvsaid motor u on'predetermlned reverse operations 'of sai device.' j

y 3. In combination, a braking devid biased in one direction, a torque motor'to operate saidl device in -a reverse direction andgto be, operated thereby .aecordin value-and means for rn ually. arresting said motorr upon pre etermined Vreverse movements of said device, said meansl permittingreverse ogerationof seid motor free y from restraint t ereby upon arresting its operation in either direction.

4. In combination, a. device biased'in one` direction, a torque motor connectedMt 'said device to operate the same and to bedriven thereby accordingito its torque, value4v and al braking device for lsaid motor operable automatiallytolimit'itsopertion'iniboth directions an to exert a' vg'radl'iated braking force theren,

5. In combination, `a device biased in one -l direction, a torque motor connected-thereto to operate the 4same und to bedriven thereby:

accordingto its torque value find a br'nkin gigs,

device -for said motor operable automatically@ Y to liuit its operation in both directions; said bra lc i ng deviceA pcrnitti restraint thereby.

`.initial'operation of seid motolln reversedirect'rns `free movements and being biased for movement` in one direction, a tor ue motor, a driving connection between sai device and said motor and a brake for said motor mechanically operable b (one of said elements upon predetermine reverse movements of said de- Vvice, said brake when set to arrest operation of said motor in either direction, permitting reverse operat'on of said motor free from restraint there y.

8. In combination, a device to be operated, a motor for operating the same, an automatically operated brake for said,` motor to limit the operation of said device, said motor having a lay relative to a member of said brake w iereby said motor when arrested may rotate in a reverse direction free from restraint by said brake.

9. In combination, a device operable inY opposite directions, a motor o eratively connected thereto, and a brake or said motor to limit its rotation in opposite directions, said motor havin a lost motion connectionA with a member cfg said brake whereby when arrested upon operation in either direction, said motor may rotate in a reverse direction free from restraint by said brake.

10. In combination, a device to be operated, a motor for operating the same, an automatically operable brake for said motor to limit the operation of said device, said motor having a lay relative to a member of said` brake W ereby said motor when arrested may rotate ina reverse direction free from restraint by Said brake, said brake being releasable by such reverse rotation of said motor.

. 11. In' combination, a device operable in opposite directions, a motor operatively connected thereto, and a brake for said m0- tor to limit its rotation in opposite directions said motor havinnr a lost motion connection with a member oipsaid brake whereby when arrested upon operation in either direction said motor may rotate in a reverse direction free from restraint by said brake, said brake being releasable by such reverse rotation of said motor.

12. In combination, a brake biased to set,

a motor, an operative connection between said brake and Said motor for release of the former by the latter and for drive of the latter by the former in resetting, said connection ermitting a limited degree of operation op said motor independently of said brake after resetting thereof and means operable automatically to thereupon brake said motor.

13. In combination, a brake biased for settin thereof, a torque motor to release said bra e and to be drlven thereby upon resetting thereof and means supplementin the resistive force of said brake to stall sai motor upon release of said brake and to arrest said motor u on resetting of said brake.

14. In com ination, a brake biased for set ting thereof, a torque motor to release said brake and to be driven thereby upon reset.

ting thereof and means supplementin the resistive force of said brake to stall sai motor upon release of said brake and to arrest said motor upon resetting of said brake, means permitting reverse operation of said motor free from restraint thereby after arresting its operation in either direction.

In witness whereof, I have hereunto subscribed my name.

JOHN .S. COLDWELL. 

